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39 lines
1.7 KiB
Text
39 lines
1.7 KiB
Text
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The autoplugger is a custom bin with a set of custom add/remove methods.
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The point is to virtually add a set of plugins that should take part in
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the autoplugging (like the src, sink elements). The autoplugger should
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try hard to included these plugins in the final pipeline.
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The autoplugger has to be a bin because else we cannot put it into the
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paused state when dynamically connecting elements.
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We cannot include the intermediate elements or sink/src elements to the bin
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right away because else they will be scheduled by the scheduler.
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The bin will use the elementfactory klass field to get a basic idea about
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the plugin:
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- the 'Source' keyword is used to detect source elements
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- the 'Sink' keyword is used to detect the sink elements or targets
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of the autoplugging.
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- other elements are considered intermediate elements and will be
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inserted when possible.
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algorithm:
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- Autoplugging starts from a source element, it will be added to the real bin.
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- for all unconnected pads:
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- if pad has NULL padtemplate caps add typefind + autoplugcache to the pad
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- if unconnected pad has fixed caps, find element in repository that can
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connect.
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- first check elements added to the bin
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- test elements ordered by rank
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- favour 'Demux' type elements close to sources, 'Decoder' elements after
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that and 'Filter' elements close to sinks.
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- link dummy element with pads with non-fixed caps. The dummy element getcaps
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function will use the repository to return a list of compatible caps, so that
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the element can choose freely. The dummy element is replaced with a real
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element when caps become fixed.
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- all new_pad signals and caps notifications trigger the above actions.
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